Injector



July 8, 1941 l. P. PEDRlcK 2,248,249

' INJECTOR Filed July 12. 1940 2 sheets-sheet 1 l MIE July 8, 1941. LP.PEbRlcK 2,248,249

INJEGTOR Filed July l2, 19404 2 Sheets-Sheet 2 WA 7E w l ,5v/unse,-

Patented July 8, 1941 il iT emes PATENT cernes William Sellers &Company,

Incorporated,

Philadelphia, Pa., a corporation of Pennsyl- Vania Application July 12,1940, Serial No. 345,073

(Cl, s-m0) 7 Claims.

This invention relates to an improvement in injectors such as are usedin connection with the supply of feed water to steam boilers.

More particularly this invention relates to injectors of the type fullyillustrated and described in United States Letters Patent No. 1,069,883,dated August 12, 1913, to Strickland Kneass, and No. 2,012,348, datedAugust 27, 1935, to Irenee P. Pedrick, which are especially adaptablefor use in connection with the supply of feed water to steam locomotiveboilers.

Injectors of the type shown and described in the two patents referred toabove have for many years proved highly efficient for the purposeintended. However, from experience it has been found that under certaincircumstances and in certain installations they exhibit certaindisadvantages.

It has now been found desirable on certain locomotives where the spacebeneath the locomotive cab is occupied with other equipment, that theinjector be placed in some other location such as ahead of the cab or insuch position that manual operation by means of a lever in the cab withextension rod is impractical.

Again, it has been found that where the injector is installed on alocomotive in a position other than more or less directly beneath theposition of the starting lever in the locomotive cab, mechanicalconnection between the starting lever and the water and steam valvelevers make for difculty in operation and enhance the disadvantagepointed out above, and, indeed, sometimes bind or become misaligned andprevent operation.

Now in accordance with this invention an injector of the type indicatedis provided which by virtue of its improved structure will be found tohave all the advantages and efciency possessed heretofore with, at thesame time, freedom from the disadvantages.

Having now indicated in a rgeneral way the nature and purpose of thisinvention, I will proceed to a detailed description of the structure ofa preferred embodiment with reference to the accompanying drawings inwhich:

Figure l is a side view, partly broken away, of the rear end of alocomotive with an injector and its operating mechanism according tothis invention installed. t

Figure 2 is a cross-sectional view of a portion of the injector andoperating mechanism shown in Figure 1.

Figure 3 is a cross-sectional View of a control valve.

In the figures variously I indicates a locomotive cab mounted as usualat the rear of the boiler 2 and a tank 3 is coupled to the locomotiveand carries'a supply of feed water for the boiler.

The injector 4, secured in any well known manner to the locomotive, isconnected to the tank through a conduit 5, provided with a shut-offvalve 3, connected with an operating lever or wheel 1, suitablysupported by a bracket 8 within the cab I, by a rod 9.

A conduit I0 leads from the boiler 2 to the injector for the supply oflive steam thereto and a conduit I I connects the delivery end of theinjector to the boiler for the delivery of feed water thereto. Theconduit I2 is connected with the overflow chamber of the injector.

The injector 4, of the type shown in the Kneass and Pedrick patentsreferred to above, comprises the usual forcing tubes I3 into which livesteam is discharged from steam chamber I4 through steam nozzle I6controlled by the steam valve I5, having a stem I'I extending withoutthe injector casing through a suitable gland II. Water is supplied tothe tubes I3 from water chamber I9, through the annular orifice I8between the steam nozzle I5 and the tubes I3. The admission of water tethe water chamber I9 is controlled by the water valve 29, having a stem2| extending without the injector casing through a suitable gland 22.'I'he ends of a lever 23 are pivotally connected to the stems I'I and 2|of the water and steam valves, respectively, and the lever is pivotallyconnected intermediate its ends to the end of a piston rod 24 extendingthrough a gland 25 into a power cylinder 26, within which it isconnected to a piston 21. The cylinder 26 is conveniently mounted on theinjector casing between the valve stems I1 and 2|, or may be mountedindependent.

of the injector such as on a bracket attached to the locomotive directlyabove the injector.

Conduite 28 and 29 lead from the opposite ends of the cylinder to avalve chamber 3U, mounted conveniently in the cab I, which is in turnconnected to a supply of fluid under pressure, as, for example, air fromthe brake system or steam from the boiler 2, through a conduit 3| andwith atmosphere through an exhaust conduit 32. Within the valve chamber30 is a cylindrical control valve 33 provided with passages 34 and 35and connected to a manipulating handle or lever 33. The passages 34 and35 in valve 33 are so arranged that on turning of the valve bymanipulation of lever 36 either end of the cylinder 26 may be connectedwith fluid under pressure, while, at the same time, the other end willbe connected with eXhaust, or the fluid pressure may be shut oi fromcylinder 2t.

As will be observed from an inspection of Figure 2, the steam valve i6in its opening movement is stopped when the head of the valve strikesthe stop x formed by the lower end of gland I3, while similarly thewater valve 2li in its opening movement is stopped when the head of thevalve strikes the stop y formed by the end of gland 22. And .it will befurther noted that the stroke or distance of travel of the Water valve2Q is greater than that of the steam valve i6. By way of example of anenlcient structure, the Water valve 2B may be arranged to have a strokeor travel of about 1.5 inches While the stroke or travel of the steamvalve is about 2%; inch.

Assuming now that the injector is out of operation with the water valve2l) and the steam valve I6 closed and the lever 36 to be in a neutralposition, as shown in Figure 2, when it is desired to start the injectorthe lever 3S will be moved to position the control valve 33 to admitfluid under pressure, for example steam, into the lower end of cylinder2S beneath the piston 2l and connect the yupper end of the cylinder toexhaust7 with the result that the piston and its rod 2li will moveupwardly. The upward movement of rod 24 will cause lever 23 to turn onits connection with the stem I1 of the steam valve t5, as a fulcrum, dueto the greater holding effect of the pressure of live steam on thesteam. chamber Hl on the top of the steam valve as compared with thewater pressure on the top of the water valve 23. Such movement of lever23 will eiect opening of the water valve 2@ and will continue until thewater valve in full open position strikes the stop y.

When movement of the water valve is stopped by the stop y, continuedupward movement of the rod 2li will cause lever 23 to turn on itsconnection with the stem 2! of the water valve 263 as a ulcrum. Suchmovement of lever 23 Will result in an opening movement of the steamvalve l, which will continue until the steam valve f.

reaches its full open position and it is stopped by the stop As has beennoted above, the stroke of the water valve greater than that of thesteam valve. Hence, the water valve being fully opened before theopening movement of the steam valve begins, the water valve cannot beclosed by the shorter opening movement of the steam valve even though,as sometimes happens, the steam valve, after being cracked, slams openwith exertion of a closing action on the water valve.

When it desired to shut the injector down, as will, it is believed, beobvious, it is only necessary to manipulate the lever 36 to positionvalve 33 to connect the upper end of cylinder 2S with fluid underpressure and the lower end with exhaust. rlhe resultant downwardmovement of piston 2l and its rod 24 will, through lever 23, rst movethe water valve and then the steam valve to closed position, since inthe closing movement the lever 23 will first turn on its connection withthe stem of the steam valve, which will be held open under steampressure, and then, when the water valve is closed, on its connectionwith the water valve.

lt will be understood that the apparatus according to this invention asdescribed above in detail and as illustrated in the accompanyingdrawings may be variously modified in detail Without departing from thescope of this invention as defined by the claims appended hereto.

What I claim and desire to protect by Letters Patent is:

l. In an injector, in combination, a water valve and a steam valvearranged to open in the same directions respectively against waterpressure and against steam pressure higher than the water pressure,stems for said valves, a cross-head pivotally connected to said valvestems, means connected to said cross-head and adapted to move it on itsconnection with the stem of the steam valve, when the steam valve isclosed, to fully open the water valve and subsequently, when the watervalve is open, on its connection with the stem of the water valve toopen the steam valve, the water valve being arranged to have a stroke ofgreater extent in its opening and closing movement than that of thesteam valve in its opening and closing movement, whereby closing of saidWater valve in the opening movement of the steam valve will be avoided.

2. In an injector, in combination, a water valve and a steam valvearranged to open in the same directions respectively against waterpressure and against steam pressure higher than the water pressure,stems for said valves, a cross-head pivotally connected to said valvestems, fluid pressure operated means actuatable in one direction formoving the cross-head on its connection with the stem of the steam valvewhen the steam valve is closed to effect full opening of the water valveand subsequently, when the water valve is open, on its connection withthe stem of the water valve to effect opening of the steam valve andactuatable in the opposite direction for moving said cross-head toeffect closing of said valves.

3. ln an injector, in combination, a water valve and a steam valvearranged to open in the same directions respectively against waterpressure and against steam pressure higher than the water pressure,stems for said valves, a cross-head pivotally connected to said valvestems, fluid pressure operated means for moving the cross-head on itsconnection with the stern of the steam valve, when the steam valve isclosed, to effect full opening of the water valve and subsequently, whenthe water valve is open, on its connection with the water valve toeffect opening of the steam valve, the water valve being arranged tohave a stroke of greater extent in its opening and closing movement thanthat of the steam valve in its opening and closing movement, wherebyclosing of said water valve in the opening movement of the steam valvewill be avoided.

4. In an injector, in combination, a water valve and a steam valvearranged to open in the same directions respectively against Waterpressure and against steam pressure higher than the Water pressure,stems forsaid valves, a cross-head pivotally connected to said valvestems, a cylinder arranged adjacent to said valves, a piston in saidcylinder, a piston rod extending without said cylinder and pivotallyconnected to said cross-head intermediate its ends, means for admittingiluid under pressure into one end of said cylinder to move thecross-head on its connection with the stem of the steam valve while itis closed to eiect full opening of the water valve and subsequently,when the water valve is open, on its connection with the stem of thewater valve to effect opening of the steam valve, and means foradmitting iluid under pressure into the other end of said cylinder tomove the cross-head to effect closure of said valves.

5. In an injector, in combination, a water valve and a steam valvearranged to open in the same directions respectively against waterpressure and against steam pressure higher than the water pressure,stems for said valves, a cross-head pivotally connected to said valvestems, a cylinder arranged adjacent to said valves, a piston in saidcylinder, a piston rod extending without said cylinder and pivotallyconnected to said crosshead intermediate its ends and means for admit-`ment of the steam valve will be avoided.

6. In an injector, in combination, a Water valve and` a steam valvearranged to open in the same directions respectively against waterpressure and against steam pressure higher than the water pressure,stems for said valves, a cross-head pivotally connected to said valvestems, uid pressure operated means actuatable in one direction formoving the cross-head on its connection with the stem of the steamvalve, when the steam valve is closed, to effect full opening of theWater valve and subsequently, when the water valve is open, on itsconnection with the stem of the water valve to eiect opening of thesteam valveand actuatable in the opposite direction for moving saidcross-head to effect closing of said valves, the water valve beingarranged to have a stroke of greater extent in its opening and closingmovement than that of the steam valve in its opening and closingmovement, whereby closing of said water valve in the opening movement ofthe steam valve will be avoided.

7. In an injector, in combination, a water valve and a steam valvearranged to open in the same directions respectively against Waterpressure and against steam pressure higher than the Water pressure,actuating means pivotally connected to said valves and adapted to moveon the pivotal connection with the steam valve, when the steam valve isclosed to fully open the water valve and subsequently, when the watervalve is open, on its pivotal connection with the Water valve to openthe steam valve, the water valve being arranged to have a stroke ofgreater extent in its opening and closing movement than that of thesteam valve in its opening and closing movement, whereby closing of saidwater valve in the opening movement of the steam valve will be avoided.

IREN EE P. PEDR'ICK.

